Question
In: Mechanical Engineering
4) A refrigerator in the kitchen at 30 ° C keeps the food section at -12...
4) A refrigerator in the kitchen at 30 ° C keeps the food section at -12 ° C. Refrigerant R-134a enters the evaporator located at the back of the freezer section of a home refrigerator with a degree of dryness of 100 kPa and 20 percent and exits at 100 kPa and -20 ° C. Since the compressor consumes 600 W and the COP of the refrigerator is 2.5, a) calculate the minimum flow (kW) required to keep the mass flow of the refrigerant, b) the heat released into the kitchen air (kW), c) the food section at -12 ° C. (20 point)
Solutions
samet mamat answered 6 months agoRelated Solutions
A refrigerator using R-12 as the working fluid keeps the refrigerated space at ?16? in an...
A refrigerator using R-12 as the working fluid keeps the
refrigerated space at ?16? in an environment at 27?. You are asked
to upgrade this refrigerator by replacing R-12 with the
ozone-friendly R-134a. What changes in the pressure levels would
you suggest in the new system? How do you think the COP of the new
system will compare to the COP of the old system?
A refrigerator using R-12 as the working fluid keeps the refrigerated space at ?16? in an...
A refrigerator using R-12 as the working fluid keeps the
refrigerated space at ?16? in an environment at 27?. You are asked
to upgrade this refrigerator by replacing R-12 with the
ozone-friendly R-134a. What changes in the pressure levels would
you suggest in the new system? How do you think the COP of the new
system will compare to the COP of the old system?
A refrigerator using R-12 as the working fluid keeps the refrigerated space at 2158C in an...
A refrigerator using R-12 as the working fluid
keeps the refrigerated space at 2158C in an environment at
308C. You are asked to redesign this refrigerator by
replacing
R-12 with the ozone-friendly R-134a. What changes in the
pressure levels would you suggest in the new system? How
do you think the COP of the new system will compare to the
COP of the old system?
Formulate the Second Law of thermodynamics and explain why the simple example of a kitchen refrigerator...
Formulate the Second Law of thermodynamics and explain
why the simple example of a kitchen refrigerator does not violate
it.
Using a thermometer, measure the temperature of the main food compartment of your refrigerator
Using a thermometer, measure the temperature of the main food compartment of your refrigerator, and check if it is between 1 and 4°C. Also, measure the temperature of the freezer compartment, and check if it is at the recommended value of 218°C.
You place your lunch leftovers in the refrigerator. Suppose the refrigerator needs to remove 1.5990E+4 J...
You place your lunch leftovers in the refrigerator. Suppose the
refrigerator needs to remove 1.5990E+4 J of thermal energy from
your lunch to cool it to the temperature of the inside of the
refrigerator. In the meantime, this means the refrigerator produces
2.1449E+4 J of thermal energy that it expels into the kitchen as a
result. What is the total work done by the compressor motor in the
refrigerator? (Ignore any thermal loses due to friction in the
motor.) Tries...
Find the x - and y - intercepts. a) 3? − 4? = 12 c) ?...
Find the x - and y - intercepts.
a) 3? − 4? = 12
c) ? = √? + 3
e) ? = |4? − 5|
g) ?2 = 5 − ?
For the following exercises, compute the value of the expression. C(12, 4)
For the following exercises, compute the value of the expression.C(12, 4)
SECTION A (30 marks) This section consists of ONE (1) compulsory question QUESTION 1 (30 marks)...
SECTION A
This section consists of ONE (1) compulsory question
QUESTION 1
ABC Ltd is a wholesaler of furniture which has been in operation
for ten years. It buys furniture from five major manufacturers and
sells them to a range of customers. The company currently has a
customer base of over 500 customers most of which are credit
customers. The receivables balance comprises customers owing up to
$2,000,000 to smaller balances of about $10,000, all with many
different due dates...
250 mL of water at 20.0 ∘C is placed in the freezer compartment of a refrigerator...
250 mL of water at 20.0 ∘C is placed in the freezer compartment
of a refrigerator with a coefficient of performance of 4.00. How
much heat energy is exhausted into the room as the water is changed
to ice at -5.00 ∘C?
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